Polyarseno compounds and process of making same.



an snares. PATENT OF PAUI: EHRLICH AND ALFRED IBER'IHEIM, OF FRANKFORT-ON-THE-MAIN, GERMANY,

ASSIGNORS TO FARBWERKE VORM. MEISTER LUCIUS & BRT j'NING, OF I-I6CHST-ON- THE-MAIN, GERMANY, A CORPORATION OF GERMANY.

PORYARSENO COMPOUNDS AND PROCESS OF MAKING- SAME.

Ho Drawing.

Patented June 23, 1914.

To all whom it may concern:

Be it known that we, PAUL EHRLICH, M. D, professor of medicine, and ALFRED BERTHEIM, Ph. 1)., chemist, citizens of the Empire of Germany, residing at Frankforton-the-Main, Germany, have invented certain new and useful Improvements in Polyarseno Compounds and Processes of Making Same, of which the following is a specification.

We have found that new arseno c0mpounds of great therapeutical value can be obtained by reducing mixtures of aromatic arsinic acids and inorganic arsenic cornpounds. The compounds" thus produced contain more than one atom of arsenic to one aromatic residue, the percentage of arsenic being the higher, the greater the quantity of inorganic arsenic compound which is used for one molecule of arsinic acid. lit is very probable that these new compounds represent a complex of atoms composed of several arsenic atoms; therefore they may be termed polyarseno compounds. They are yellow to reddish-brown powders, which are oxidized by hydrogen peroxid with simultaneous formation of an aromatic arsinic acid and arsenic acid; they are insoluble in water, scarcely soluble in ether, benzene and petroleum, diihcultly soluble in strong hydrochloric acid, and decompose when heated. They are of great therapeutical value in the treatment of animals infected with tripanosomes.

The following example illustrates our invention:23.3 grams of ISA-aminoiixyphenylarsinic acid are dissolved in 400 cc. of water plus 60 cc. of 2N 'c'austic soda lye, and 13 grams of sodium arsenite are dissolved in 500 cc. of water. These solutions are mixed and neutralized with cc. of 2N acetic acid. The whole is then poured into a solution of 500 grams of sodium hydrosulfite and 100 grams of magnesium chlorid in 2.5 liters of water and digested at 50-55 C., while well stirring, until a filtered sample, when heated, no longer separates a precipitate. The precipitate which is copiously formed is filtered off, washed and dried in cacao. It is an orange-colored powder, which is oxidized in alkaline solution by means of hydrogen peroxid with formation of aminotixyphenylarsinic acid and arsenic acid. It is diflicultly soluble in ether, benzene, alcohol and concentrated hydrochloric acid. It is readily dissolved by diluted hydrochloric acid and by aqueous caustic soda lye, and a difiicultly-soluble sulfate is precipitated from the hydrochloric solution by the addition of. surfuric acid.

Having now "described our invention, what we claim is: i

1. The process of producing polyarseno compounds, which consists in reducing mixtures of aromatic arsinic acids and inorganic arsenic compounds. 7

2. As new products, polyarseno compounds which contain more than one atom of arsenic to one aromatic residue, being yellow to reddish-brown powders, which are split up by hydrogen peroxid with simultaneous formation of an aromatic arsinic acid and arsenic acid, are scarcely soluble in ether, benzene and petroleum, diiiicultly soluble in strong hydrochloric acid, and decompose when heated.

3. As a new product, the compound ob tained by reducing a mixture of equivalent quantities of 3.4-aminooxybenzene-arsinic acid and sodium arsenite, being an orange yellow powder, which is oxidized by hydrogen-peroxid in alkaline solution with formation of aminoiixyphenylarsinic acid and arsenic acid, is diflicultly soluble in ether,

benzene, alcohol and concentrated hydrochloric acid, and readily dissolves in diluted hydrochloric'acid and aqueous caustic soda lye, a diflicultly-soluble sulfate being precipitated from the hydrochloric solution by the addition of sulfuric acid.

In testimony whereof, we afiix our signatures in the presence of two witnesses.

PAUL EHRLICH. ALFRED BERTHEIM.

Witnesses:

JEAN GRUND, CARL GRUND. 

